Jacket or outside form for manufacture of concrete pipe



Oct. 21"; 1924. 1,512,198

v Y Y A. A. CLARK JACKET OR OUTSIDE FORM FOR MANUFACTURE OF CONCRETE PIPE Filed June 19. 1923 gmewio r,

Patented Get. 21, 1924. I

YFFICE.

ASA ALAN CLARK, F PIXLEY, CALIFORNIA.

' JACKET OR OUTSIDE FORM FOR MANUFACTURE OF CONCRETE PIPE.

Application filed June is,

To all whom it may concern:

Be it known that I, AsA ALAN CLARK, a citizen of the United States, residing at Pixley, in the county of Tulare and State of California, have invented. a new and useful Jacket or Outside Form for Manufacture of Concrete Pipe, of which the following is a specification.

This invention relates to an improved jacket or outside form for use in molding or manufacturing concrete pipe sections.

In the manufacture of concrete pipe a cylindrical jacket is employed which encloses the outer wall of the concrete pipe to be formed, the concrete pipe being molded in the jacket. The cylindrical jacket is split parallel to the sides of the cylindrical jacket in order to permit'the jacket to be removed from the concrete pipe section after the same has been molded therein. Such splitconcrete jackets are equipped with suitable tightening means for tightening the split jacket and holding the same in place during the formation of the pipe. The split cylindrical acket, being in contact with the concrete as the same is in motion during manufacture of the pipe, is subjected to rapid erosion and wear and has a relatively short life, particularly when used with pipe making machines using the packer head principle. This, with the common form of jacket necessitates a complete replacement of the jacket with a corresponding waste of the parts not worn or eroded and involves a large expense.

An object of this invention is to provide an eroded jacket with a replaceable cylindrical liner to the end that upon erosion of the liner a new liner may be substituted therefor and the expense of providing an entirely new jacket as each liner is worn may be eliminated.

Another object of this invention is to provide a jacket with a split cylindrical shell or liner and with a skeleton frame adapted to surround the liner upon which frame is mounted the tighteners used to secure the split liner and for opening and closing the jacket.

The object and advantages of this invention will be apparent from the description hereinafter contained, the accompanying 1923. Serial No. 646,333.

drawing illustrates the preferred form or embodiment of the invention.

Figure 1 is a side view of the liner embodying the invention.

Fig. 2 is a section on Figure 1.

In the drawings: i

1 indicates a cylindrical or shell liner, which preferably extends throughout the length of the jacket and is split parallel to the cylindrical walls as indicated at 2.

2 generally indicates a skeleton frame for the liner, which frame comprises a plurality of hoops 4 which are spaced one-from the other "and riveted to stays 5 which rigidly unite the hoops together. Three of such the line 2 2 of hoops are shown in the drawings, each being 7 split as indicated at 6, preferably the splits 6 being at corresponding or alining positions on the separate hoops 41.

Extending across the split ends of the frame and preferably secured to the stays L.

next adjacent the split ends of the hoops is provided a plurality of tighteners 7 which are spaced along the jacket. Said tightener 7 comprises brackets 8 riveted to a stay 5 adjacent a split 6 of the hoops 4, which brackets provide projecting ears 9, which support a pin 10. 11 indicates arod journalled at one end to the pin 10 and screwed into a second rod section 12. The second rod section 12 extends across the slits 6 of the spaced across the slits from the brackets 8,

said brackets 15 provide ears 16 which support a pin 17 Arms 18 are journaled to the pins 17 at one end and provide bearings 19 which support the rod 13. The rod 13 thus provides a means for connecting the spaced tighteners so that the same may be simultaneously operated. The bent portion 14 of the rod section 12 permits the arms 18 to assume the osition indicated in Figure 2, wherein the 'ne joining the axis of the rod 13 and pins 9 has slightly passed the axis of the pin 16 supporting the arm 17; in such position the rod 12 contacts with the shaft 13 to maintain the tighteners inthe position indicated in Figure 2. 20 indicates a lever keyed to the shaft 13, Which is bent into a U-shape as indicated in Figure 2 to provide a convenient handle for lifting the jacket, one end 21 of the lever 20 abutting the inner liner 1 When the jacket is in the tightened position as indicated in Figure 2.

22 indicates a handle which may be riveted to a stay 5 or hoop & and preferably spaced from the lever 20 so that the handle 22 and lever 20 together provide tWo grips for handling the jacket. Lugs or projections 23 extend from the outside of the inner liner 1 or from the inside of the skeleton frame and fit in openings 24 in the skeleton frame or vice versa to lock the liner to the frame.

lVhen using the acket the skeleton frame 3 is preferably placed around the slit inner lining 1 with the slits 2 and 6 preferably closely ad'acent but not alining, as illustrated in igure 2. In placing the skeleton frame around the liner 1 the tightening means are moved to the dotted position as indicated in Figure 2. Bythen moving the lever 20 to the position shown in Figure 2 the tighteners draw the slit frame together tightening the frame around the liner 1 and hold the jacket in place for molding the concrete pipe therein, the projecting lugs in the holes provided preventing the inner lining from slipping out of the skeleton frame When the jacket is stripped from the finished pipe.

While the jacket herein described is Well suited for the purposes of this invention various modifications may be made in the details of construction Without departing from the spirit of the invention. This inthe frame around the liner, and projections extending from the liner engaging the frame.

2. In a concrete jacket, the combination of a split shell liner, a skeleton frame enclosing the liner, said frame comprising a plurality of split hoops and a plurality of stays rigidly connecting said split hoops, means for tightening the frame around the liner, and projections extending from the liner engaging the frame. I

3. In a concrete jacket, the combination With a split cylindrical liner of a plurality of spaced split hoops, stays riveted tothe hoops rigidly connecting the same, spaced tighteners connecting the split ends of the hoops, a tightening lever, means connecting the tighteners to the lever, and projections extending from the liner engaging the frame.

4. In a concrete jacket, the combination With a split cylindrical liner, of aframe comprising a plurality of split hoops, stays riveted to the hoops to rigidly connect the same, spaced tighteners each extending across the split ends of the frame and secured to' stays adjacent the split ends of the hoops, a lever, means connecting the tighteners to the lever, and projections extending from the liner engagin the frame. Signed at Pixley, Cahforma, this 12th day of June, 1923. H

ASA ALAN CLARK. 

